GCTool

As an alternative you can use the Java program here. It can also view and restore deleted events.

On Windows/Linux you need to have Java installed. If you don’t have Java, install it from http://www.java.com.

After starting it you first have to sign in and allow the program to access your calendar:

Then you should see the window below. Select a calendar, click on "Load recently deleted events", select one or more events to undelete and undelete them by clicking on "Undelete selected events". You can select multiple events by selecting the first one and clicking on the last one while holding SHIFT (to select that range of events).

After a few seconds the selected events should vanish from the list because they are no longer deleted. Now click “Refresh” in Google Calendar or reload the website in your browser to see the undeleted events: